Yeah- a very interesting statement. He's got to be talking about Gandalf's point of view.

He might be referring to discovering Thrain in the dungeons of Dol Guldur, or alternatively he could mean the whole attack on Dol Guldur and viewing the Quest for Erebor from Gandalf's point of view. It's maybe a bit much to conclude that Gandalf will definitely be the protagonist in the sequel film, but looks like he's going to feature lots. View my Hobbit Film Adaptation Discussion